Final A.B.V

Discussion in 'Homebrewing' started by IRISHFAN951, Aug 4, 2014.

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  1. IRISHFAN951

    IRISHFAN951 Initiate (0) Jul 23, 2014 California

    Rookie here working on my first brew! So I've had my beer getting nice and tasty up in my primary fermenter for 7 days now and racked it to secondary today. I took a hydrometer sample and got a reading of 1.012, which is the F.G that the recipe says I'm going for. My question is, how much will my A.B.V increase in another 7 days being in the secondary or what would happen if i bottle now?

    Slainte!!
     
  2. fuzzbalz

    fuzzbalz Pundit (953) Apr 13, 2002 Georgia

    Depends on the type/condition of your yeast and the fermentation temps and S.G. so hard to say but I would let it go at least another 7 days. Most of my beers avg 14-21 days and are mostly ales.
     
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  3. HerbMeowing

    HerbMeowing Maven (1,295) Nov 10, 2010 Virginia
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    Why would anyone rack to a 2ndary after seven days?
     
  4. tngolfer

    tngolfer Initiate (0) Feb 16, 2012 Tennessee

    Sometimes I do in combination with a cold crash to help clear the beer. Also, transferring to a smaller secondary (5 gal vs. 6.5 gal primary) results in less surface area on the top and less chance for oxidation.
     
  5. IRISHFAN951

    IRISHFAN951 Initiate (0) Jul 23, 2014 California

    I'm brewing a brown ale, its been fermenting at around 75 degrees. Its wrapped in a wet shirt now
     
  6. tngolfer

    tngolfer Initiate (0) Feb 16, 2012 Tennessee

    OP - you could transfer to secondary, leave it in primary for another week, or most likely go head and bottle. I say most likely because we don't know what style, OG, etc. you are brewing. You mentioned you are at the target FG so you are probably good to go but some additional details may help get better answers.

    EDIT - I see you posted that it is a brown ale as I was responding. I would guess your yeast is finished, especially at 75. They should have been very active in that range. Some additional time in primary or secondary may help 'clean' up your beer prior to bottling.
     
    IRISHFAN951 likes this.
  7. IRISHFAN951

    IRISHFAN951 Initiate (0) Jul 23, 2014 California

    Thanks, I'll keep it in secondary for at least a few day
     
  8. PortLargo

    PortLargo Pooh-Bah (1,831) Oct 19, 2012 Florida
    Pooh-Bah

  9. HerbMeowing

    HerbMeowing Maven (1,295) Nov 10, 2010 Virginia
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    If the temperature was 75°F and the hydro was 1.012, then the gravity wasn't 1.012.
     
  10. IRISHFAN951

    IRISHFAN951 Initiate (0) Jul 23, 2014 California

    Why is this?
     
  11. Scope4Beer

    Scope4Beer Zealot (677) Sep 28, 2009 Pennsylvania
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    Transferring to a secondary does provide less head space, but the act of transferring alone introduces oxygen into the beer, which in turn leads to oxidation. In a larger primary vessel, fermentation produces CO2 and drives out most, if not all, oxygen in the head space. There is much less chance of oxidation just letting the beer sit in the primary.
     
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  12. ThomP

    ThomP Initiate (0) Nov 22, 2007 Texas

    due to calibration temperature of the hydrometer. it is actually 1.014 if your sample was 75F. Just leave it in the fermentor for a week and bottle with the appropriate priming sugar or keg. Don't sweat it.
     
  13. Scope4Beer

    Scope4Beer Zealot (677) Sep 28, 2009 Pennsylvania
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    You have to correct the gravity reading for the temperature at which it is taken. The warmer the beer (or wort), the higher the true gravity actually is. If your beer was reading 1.012 at 75F, the real OG is actually 1.013. It's mostly splitting hairs near room temp though. You can find online calculators that do this for you. I use the one at brewersfriend.com.
     
    IRISHFAN951 likes this.
  14. IRISHFAN951

    IRISHFAN951 Initiate (0) Jul 23, 2014 California

    Would a refractometer be worth the buy?
     
  15. Scope4Beer

    Scope4Beer Zealot (677) Sep 28, 2009 Pennsylvania
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    If you do all grain or partial mash brewing, then yes. If you're doing extract, the hydrometer is all you need. Plus, hydrometer's don't work after fermentation because the alcohol messes with the accuracy. There's an equation to convert accurately, but using the hydrometer post-fermentation is easier.
     
  16. hopfenunmaltz

    hopfenunmaltz Pooh-Bah (2,635) Jun 8, 2005 Michigan
    Pooh-Bah

    You can do closed transfers under CO2. How do you think the pros do it?
     
  17. VikeMan

    VikeMan Grand Pooh-Bah (3,067) Jul 12, 2009 Pennsylvania
    Pooh-Bah

    Why would a refractometer be needed for all grain/partial mash but not for extract? I would say there's no difference in utility arising from the type of batch.

    I think you meant to say refractometers don't work after fermentation. But of course there are calculators to correct that, as you pointed out. I disagree that hydrometers are easier. A refractometer takes 2 drops of wort/beer and 3 seconds to read.
     
  18. mikehartigan

    mikehartigan Maven (1,421) Apr 9, 2007 Illinois

    Actually, you're both right. Neither a hydrometer nor a refractometer works after fermentation. The refractometer because alcohol affects the refractive index, the hydrometer because alcohol lowers the specific gravity. We ignore the hydrometer's inaccuracy and just use the numbers it gives us because ...well, we just do. OTOH, we dwell on the refractometer's inaccuracy because ...beats the hell out of me! :confused: (I'm most amused by the fact that the calculations we use convert the refractometer's 'inaccurate' reading into an approximation of a hydrometer's 'inaccurate' reading.

    Either one will get the job done if used correctly. A refractometer just gets the job done quicker and easier, IMO, and with less waste. (and if you're like many of us, you won't need to replace it as often, so it's a far cry cheaper, too!)

    I would add that, since it only takes a drop or two, a refractometer is a far better choice if you make small batches.
     
    #18 mikehartigan, Aug 4, 2014
    Last edited: Aug 4, 2014
  19. VikeMan

    VikeMan Grand Pooh-Bah (3,067) Jul 12, 2009 Pennsylvania
    Pooh-Bah

    We ignore this in the sense that we don't calculate a correction and then enter that corrected number into some ABV formula.
    But the ABV formulae don't ignore this (i.e. they do the correction internally). And the more accurate versions of the formulae do a better job of not ignoring it than the simplest versions.
     
  20. mikehartigan

    mikehartigan Maven (1,421) Apr 9, 2007 Illinois

    Very few people I know use the 'more accurate' versions of the formulae, choosing, instead, to stick with (OG-FG)*131, which becomes increasingly inaccurate as OG rises. Unfortunately, the 'more accurate' versions are not pencil and paper friendly. So, while you're correct that some ABV formulae don't ignore this, the most popular ones do.
     
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